The Treaty or Peace of Saint-Germain-en-Laye of 19 June (OS) or 29 June (NS) 1679 was a peace treaty between France and the Electorate of Brandenburg. ...
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It restored to FranceĀ“s ally Sweden her dominions Bremen-Verden and Swedish Pomerania, lost to Brandenburg in the Scanian War. Sweden ratified the treaty on 28 July 1679.
The treaty is by some considered "the worst political defeat" of Elector Frederick William I. He was forced by France to give away the Swedish portion of what he considered his rightful Pomeranian inheritance, despite having conquered it in a four-year campaign.